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2. Parallel rulers - Wikipedia

   en.wikipedia.org/wiki/Parallel_rulers

   Parallel rule in plastic with aluminum arms lying on a cutting mat. Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.

3. Parallel (engineering) - Wikipedia

   en.wikipedia.org/wiki/Parallel_(engineering)

   A parallel is a rectangular block of metal, commonly made from tool steel, stainless steel or cast iron, which has 2, [1] 4 or 6 faces ground or lapped to a precise ...

4. Engineering drawing abbreviations and symbols - Wikipedia

   en.wikipedia.org/wiki/Engineering_drawing...

   The issuance of a drawing from the engineering/design activity to the production activity. In other words, the event when a draft becomes a completed, official document. A stamp on the drawing saying "ISSUED" documents that RTP has occurred. RTV: room-temperature vulcanizing; return to vendor: 1. RTV sealants, a way to seal joints. 2.

5. Technical drawing tool - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing_tool

   [6]: 35–36 A drafting machine allows easy drawing of parallel lines over the paper. The adjustable angle between the rulers allows the lines to be drawn in varying accurate angles. Rulers may also be used as a support for separate special rulers and letter templates. The rules are replaceable and they can be for example scale-rules.

6. T-square - Wikipedia

   en.wikipedia.org/wiki/T-square

   T-squares are available in a range of sizes, with common lengths being 18 inches (460 mm), 24 inches (610 mm), 30 inches (760 mm), 36 inches (910 mm) and 42 inches (1,100 mm). [ citation needed ] In addition to drawing horizontal lines, a T-square can be used with a set square to draw vertical or diagonal lines. [ 1 ]

7. Drafting machine - Wikipedia

   en.wikipedia.org/wiki/Drafting_machine

   A drafting machine is a tool used in technical drawing, consisting of a pair of scales mounted to form a right angle on an articulated protractor head that allows an angular rotation. [ 1 ] [ 2 ] The protractor head (two scales and protractor mechanism) is able to move freely across the surface of the drawing board , sliding on two guides ...